Bushing



EDWARD H. warren,

MACHINES (30., OF SEATTLE, WASHINGTON,

0F SEATTLE, WASHINGTON, ASSIGNOR TO SMITH CANNERY A CORPORATION OFWASHINGTON.

BUSHING.

Specification of Letters Patent.

Patented Oct. 19, 1920.

Application filed December 14, 1917. Serial No. 207,197.

J 0 all to 710m it may concern:

Be it known that I, EDWARD II. WAUGH, a citizen of the United States,and resident of the city of Seattle, county of King, and State ofWashington, have invented certain new and useful Improvements inBushings, of which the following is a specification.

My invention relates to means for secur ing bodies upon shafts wherein asl'tted clamping sleeve is inserted between the shaft and the body to besecured thereto, said sleeve and one of the other parts being providedwith engaging threads and also with surfaces which engage to resistrelative angular movement, a clamping action being secured by the ridingof said parts upon the slope of the threads. My present invention is animprovement upon the device as shown in my former Patent No. 1,229,837,issued June 12, 1917, and comprises the novel constructions which aredefined by the claims.

In the drawings I have shown my invention in the form of constructionwhich is now most preferred by me.

Figure 1 outer body which is to be secured to the shaft and a side viewof the clamping sleeve, the shaft being indicated in dotted lines.

Fig. 2 is a face view of the head end of the sleeve.

In using the device shown in my former Patent No. 1,229,837, of June 12,1917, I have found that its action is imperfect in two respects.- Unlessthe bars formed by the longitudinal slits are made quite thick, being inno way supported or connected except at one end, thereis a tendency totwist out of parallelism with the axis of the shaft, or toward helicalpositions. Where the bars are made thick enough to satisfactorily resistthis tendency, they will not spring as they should to take up thelooseness in the fitting of the parts.

One of the purposes sought in using this type of securing mechanism isto secure a body tightly upon and accurately concentric with a shaftwhich may be somewhat smaller the maximum which will This result issecured by bars which may give in diameter than enter the sleeve.slitting the sleeve into radially and by causing the body which isthreaded thereon to ride upon the flanks of the threads, therebypowerfully forcing these arms laterally against the other body.

It is evident that the more the arms can arms at the head end. g is cutentirely through the head 11, but in is an axial section through the g ihat I spring the greater the range in diameter of shafts it can besecured upon. In the former construction, making these arms light enoughto permit their giving enough radially, made them so weak thatdeformation of a helical character occurred.

To secure a greater radial resiliency together with the ability toresist torsional deformation, I do not entirely sever all of the One ofthe slits, 20,

the othersa thin web 10 is left, thus tying this end of the arms 1together.

This web or tongue 10 is permit compression of the sleeve and yet itprevents any lengthwise movement of the sleeve, such as would occur withtwisting of the arms.

To secure a greater resiliency at the other I continue the extensions 21of the slots in a helical direction. I may also widen theslots, as hasbeen shown.

The helical arrangement of the slot extensions 21, makes the bars 12longer and narrower than if they were parallel to the axis of. theshaft, therebyincreasing their resiliency and their range of movement.

The body illustrated as secured upon the shaft is a cutter head,although it might be some other kind of a body. It is shown as end ofthe sleeve,

' having a plate 4: at oneside which has a conical or tapering surfaceengaging a like surface upon the head 11 of the sleeve, and a plate 3which is threaded complementary to the threads 5 of the sleeve.

By the change in construction described I secure a greater range ofaction of the sleeve than can be secured by the type of constructionshown in said patent. I have found that although the sleeve may be avery loose fit upon a shaft whenfirst slipped thereon, it will e enoughto tightly grip the shaft when the head is turned thereon and also thatthe head is alwavs held concentric with the shaft.

claim as my invention is: 1

- 1. A sleeve for use in securing a bodyabout a shaft, having aprojecting head at one end adapted to engage the outer body to preventrelative movement lengthwise of its axis, and having a threaded sectionbetween its ends, the other end of the sleeve being adapted to projectbeyond the outer body, said sleeve being slit lengthwise into aplurality of bars, said slits in the portion prothin enough to 'itsends, the other end jecting beyond the outer body extending in helicaldirections.

2. A sleeve for use in securing a body about a shaft, having aprojecting head at one end adaoted to engage the outer body to preventrelative movement lengthwise of its axis, and having a threaded sectionbetween 01' the sleeve being adapted to project beyond the outer body,said sleeve being slit from its head one to near its other end, theslits in that portion which is adapted to project beyond the outer bodyextending in helical directions.

3. A sleeve for use in securing a body about a shaft, having aprojecting head at one end adapted to engage the outer body to preventrelative movement lengthwise of its axis, and having a threaded sectionbetween its ends, the other end of the sleeve being adapted to projectbeyond the outer body, said sleeve near its other end, the slits in thatportion being slit from its head end to which edanted to project beyondthe outer body extending in helical directions, and all of said slitsbut one being bridged at the head end by thin webs.

4. The combination with shaft member and a member to be secured thereon,of a sleeve having a clamping section with a nontapered portioninterposed between said members and slit to form a plurality of bars,said section of the sleeve and one of the members having threadedengagement, said sleeve also having joined thereto a portion having asurface engaging said member to resist relative axial movement, thesleeve having an end projecting from said member and containinghelically-disposed extensions of the above mentioned slits which stopshort of this end 01 the sleeve.

Signed at Seattle, lVashington, this 5th day of December, 1917.

EDWARD H. WAUGH.

